Hello I have a Toshiba hard drive. I am trying to copy the files to another external file and some of them simply won't copy - I keep getting the error message that the file cannot be read/opened from the folder/source. The 'problematic' files work perfectly fine when I open them (and no, they don't have commas, colons or other potentially problematic characters). I have tried copying the files to other external drives, other computers, and it's always the same ones that cause the problem. What is the issue? I really don't know what I should do - the files are very important and I am super frustrated.